1257999159 has 8 divisors (see below), whose sum is σ = 1681645680. Its totient is φ = 836509376.

The previous prime is 1257999097. The next prime is 1257999163. The reversal of 1257999159 is 9519997521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1257999159 - 2⁹ = 1257998647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1257999099 and 1257999108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257999859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537822 + ... + 540155.

It is an arithmetic number, because the mean of its divisors is an integer number (210205710).

Almost surely, 2^1257999159 is an apocalyptic number.

1257999159 is a deficient number, since it is larger than the sum of its proper divisors (423646521).

1257999159 is a wasteful number, since it uses less digits than its factorization.

1257999159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078369.

The product of its digits is 2296350, while the sum is 57.

The square root of 1257999159 is about 35468.2838462760. The cubic root of 1257999159 is about 1079.5102829480.

The spelling of 1257999159 in words is "one billion, two hundred fifty-seven million, nine hundred ninety-nine thousand, one hundred fifty-nine".